Fluid-tight coupling



Jan. 13, 1931. ANDERSON 1,788,365

FLUID TIGHT COUPLING Filed Sept. 25, 1926 fifpzzz oz t- 499. /r4 4%,

Patented Jan. 13, 1931 I UNITED STATES PATENT OFFICE ERNST G. K. ANDERSON, OF EVANSTON, ILLINOIS, ASSIGNOR TO APPLETON ELECTRIC -COMPANY, A CORPORATION OF ILLINOIS FLUID-TIGHT COUPLING Application filed September 25, 1926.' Serial No. 137,637.

The present invention has for its object to until the edgesbounding. the mouth of the permit a threadless conduit to be coupled to trough in the mug are engaged respectively another conduit or element in such a manner with the end of the member 2 and with the as to make between them a sealed joint bottom of the cup, any further tightening of through which fluids, even though under the cup-shaped nut results in a distortion of 55 considerable pressure, are unable to pass. the ring. The ring is prevented from The various features of novelty whereby spreading radlally by the surrounding nut, my invention, is characterized will hereinand therefore the sides of the trough must after be pointed out with particularity in the yield so as to become more nearly parallel.

m claims; but, for a full understanding of my The result of the deflection of the sides .of a invention and ofits ob'ects and advantages, the trough is that the comparatively sharp reference may be had to the following deedges around the mouth of the trough bite tailed description taken in connection with into the softer metal 01" the pipe along two the accompanying drawing, wherein: separated lines extending entirely around Figure 1 is a top plan view of a fragment the pipe. Furthermore, that side of the as of a connection box and a pipe or conduit trough in contact with the end of the neck in the act of being connected thereto, parts 2 Seats itself tightly against the neck and being broken away; Fig. 2 is a view partly there forms a seal. The pipe may be somein plan view and partly in transverse secwhat smaller in diameter than the internal tion, showing the various elements of Fig. 1 diameter of the neck, in order to avoid the 70.

in their completely coupled relations; Fig. necessity of a machined fit so that the inner 3 is an end, on a larger scale than Figs. 1 and edge of the sealing ring tends to enter the 2, of the sealing ring; Fig. 4 'is a central space between the pipe and the surrounding transverse section through the sealing ring; neck and thus wedges itself tightly between and Fig. 5 is a view partly iii-section and the pipe and the neck while it is cutting into 75 partly in elevation, showing my improved he metal of the pipe. coupling employed for connecting two pipes P y 13 a fluld'tight Seal Produced by togethen my improved coupling, but the sealing ring Referring to Figs. 1 to 4, 1 represents a possessessufiicient mechanical strength to box having at one end a tubular neck 2 exlock the pipe rigidly to the member 1 producso ternally screw-threaded; the neck being pro-- a joint that is Strong mechanically vided with an internal shoulder 3 at its in- In Fig. 5 th re are shown two pipes 8 and ner end. 4 is a pipe that extends into the ticonnected together by a coupling comprismember 2, preferably abutting against the mg a sleeve 10 externally screw-threaded at shoulder 3 at its inner end. Screw-threaded the ends, together with two cup-shaped nuts as upon the part 2 is a cup-shaped member 5 11 and 12 similar to the nut 5. The two having in the bottom wall thereof a hole pipes enter opposite ends of the sleeve and large enough to permit the pipe to pass engage with a central internal rib 13 in the through the same. Surrounding the pipe sleeve. Sealing rings 14, similar to the ring within the member5isasea-ling ring 6. This 6, are placed within the nuts 11 and 12 90 ring is preferably made of comparatively around the two pipes. thin steel pressed or otherwise formed to pro- While I have illustrated and described duce an annular trough whose bottom forms with particularity only a single preferred the periphery of the ring, While the sides 7 form of my invention, I do not desire to be of the trough flare outwardly at an angle of limited to the exact structural details thus 95 about 45 degrees. The edges of the ring are illustrated and described; but intend to cover preferably made very thin. The ring is so all forms and arrangements which come proportioned that it may be slipped easily within the definitions of my invention conupon the pipe and into the member 5. WVhen stituting the appended claims.

the member 5 is screwed upon the neck 2, I claim: 1 0

1. In combination, an externally threaded tubular member, a pipe extending into said member, a ring of harder metal than the pipe surroundin t e latter, said ring being in the form of a t in-walled trough having flaring sides extending inwardly rom the periphery for engagement with the pipe, and a nut on said tubular member having a shoulder to engage with the outer side of the ring and press the rin against the end of said tubular member, t 1e parts being so proportioned that the nut engages with the periphery of the ring to prevent expansion of the latter.

2. In combination, an externally threaded member, a pipe'extending into the same, a ring of harder metal than the pipe in the form of a thin-walled trough having sides extending inwardly from the periphery, the

sides of the trough being presse into the metal of the pipe, and a nut member engaged with the periphery of the ring and having a shoulder engaged with the outer side of the trough and pressing the inger side against the end of said tubular mem- In testimony whereof, I sign this specification.

ERNST G. K. ANDERSON.

on said tubular 

